JPH08156140A - Grip - Google Patents

Abstract

PURPOSE: To obtain a grip good at both wet and firm feelings without deteriorating such properties as elongation and hardness by using a composition in which a specified amount of tackifier and a short fiber reinforced rubber masterbatch are blended into natural rubber or synthetic rubber. CONSTITUTION: A rubber composition is composed of 100 pts.wt. natural rubber or synthetic rubber, 20-100 pts.wt. tackifier, and a short fiber reinforced rubber masterbatch containing 1-7 pts.wt. of short fibers. A liquid polymer or oligomer is used chiefly as the tackifier. A liquid petroleum resin of 4-5C fraction such as polybutene and polypentadiene is used as the liquid polymer. In the preparation of the masterbatch, organic short fibers, after being surface-treated with a rubber-reactive reagent, are kneaded into rubber, and the mixture is melt- extruded to disperse the fibers finely into the rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grip suitable for a golf club, a tennis racket, a grip for sports equipment such as skiing stock, a grip for a bicycle handle, and the like.

[0002]

2. Description of the Related Art Conventionally, grips have been provided on sports equipment, bicycle handles, etc. as a slip stopper during gripping. It is necessary for this grip to have a good feeling of being moist (feeling like a fit on the hand) and a firm feeling (feeling that it is difficult to move with respect to the hand), which is the feeling when gripped with the hand. However, when the moist feeling is enhanced, the grip becomes too soft and the feeling is impaired.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a grip excellent in both moist feeling and firm feeling without impairing physical properties such as elongation and hardness.

[0004]

The grip according to the present invention comprises 20 to 100 parts by weight of a tackifier and 100 parts by weight of natural rubber and / or synthetic rubber, and a short fiber reinforced rubber masterbatch as a short fiber amount of 1%. It is characterized in that it is composed of a rubber composition containing 7 to 7 parts by weight. As described above, since the grip of the present invention contains the tackifier and the short fiber reinforced rubber masterbatch in rubber, the above object can be achieved.

Hereinafter, the configuration of the present invention will be described in detail. Natural rubber and / or synthetic rubber Examples of synthetic rubber include butadiene rubber (BR),
Isoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), acrylonitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene propylene rubber (EPR), butyl rubber (IIR), acrylic rubber (ACM), chlorosulfone Polyethylene (C
SM), or a mixture of two or more thereof. Tackifier Liquid polymers and / or oligomers are mainly used. The liquid polymer is, for example, C ₄ such as polybutene, polypentene, pentadiene or cyclopentadiene,
Liquid petroleum resin of C ₅ fraction.

The molecular weight should be 200 to 50,000.
Yes. These may be used alone or as a blend,
Or these are C₂, C₃Used by copolymerizing with fractions etc.
Good. C_FourThe distillate is "Nisseki Poly" manufactured by Nippon Petrochemical Co., Ltd.
Butene ”etc. are often used. C _FiveAs a fraction, Maruzen stone
"Maruka clear" made by Yuka is easily available and effective
Is.

The liquid polymer may be liquid rubber such as liquid polybutadiene and liquid polyisobutylene. Besides liquid polyisoprene, liquefied natural rubber, liquid polysulfide rubber, liquid polychloroprene, liquid rosin is also used. These are preferably non-functional groups, hydrogenated types, and the like, which have low reactivity, because they do not increase the hardness of the grip product.

Examples of the oligomer include butadiene oligomer, isoprene oligomer, styrene oligomer and the like, and a mixture thereof can also be used. These may or may not have a functional group at the terminal, but a functional group is more stable and easier to use. In addition, a rosin derivative also has a tackifying effect, and a liquid rosin resin is particularly effective. Short fiber reinforced rubber masterbatch A general technique is to mix so-called cut fibers obtained by cutting organic fibers into about 1 inch into rubber by a kneader.
However, this method is not suitable because the modulus of the rubber is increased and a firm feeling as a grip is secured, but the breaking physical properties such as tensile strength are impaired and the rubber is easily worn. On the other hand, the one used in the present invention is obtained by surface-treating organic short fibers with a substance having reactivity with rubber, kneading into rubber and melt-extruding it to disperse it in the form of ultrafine fibers. It is a thing.

The organic short fibers are, for example, polyamide short fibers such as nylon. Fiber diameter 0.05μm-0.8
It has a length of 10 μm to 200 μm and is extremely oriented in one direction in rubber. This organic short fiber is surface-treated with a material having reactivity with rubber. Here, as the "having reactivity with rubber", for example, a so-called novolak, such as an initial condensate of a novolak type phenol formaldehyde resin, is suitable.

When kneaded into rubber, the ratio of rubber: organic short fibers is preferably 2: 1 (% by weight). The rubber used is not specified, and NR, SBR, EPDM, N
A vulcanizable rubber such as BR or CR may be used. As the short fiber reinforced rubber masterbatch, for example, "UBEP manufactured by Ube Industries"
OL HE1000 "is commercially available. In the present invention, 20 to 100 parts by weight of the tackifier and 100 to 100 parts by weight of natural rubber and the short fiber reinforced rubber masterbatch are used as short fiber amounts of 1 to 1. 7
Add parts by weight.

When the amount of the tackifier is less than 20 parts by weight, the tackiness is inferior and there is no moist feeling, while when it exceeds 100 parts by weight, it becomes too soft. When the short fiber reinforced rubber masterbatch has a short fiber amount of 1 to 7 parts by weight, the elasticity of the obtained grip is increased and a firm feeling is secured. If it is 8 parts by weight or more, it becomes difficult to disperse the short fiber reinforced rubber masterbatch in the rubber, and the physical properties of the obtained grip are significantly impaired.

[0012]

[Examples] Rubber compositions were prepared according to the compounding contents (parts by weight) shown in Tables 1 and 2 to prepare golf club grips (Examples 1 to 5 and Comparative Examples 1 to 6). Physical properties of these grips (tensile strength, elongation, 100% modulus,
The hardness) was evaluated by a conventional method, and the feel (moisturization and firmness) when gripped with a hand was evaluated. The results are also shown in Tables 1 and 2.

[0013]

[Table 1]

[0014]

[Table 2] As is clear from Tables 1 and 2, it is understood that the grips of the present invention (Examples 1 to 5) are excellent in moist feeling and firm feeling without impairing the physical properties.

[0015]

As described above, in the grip of the present invention, 20 to 100 parts by weight of the tackifier and the short fiber reinforced rubber masterbatch are used as the short fiber amount per 100 parts by weight of the natural rubber and / or the synthetic rubber. Since the rubber composition is composed of about 7 parts by weight, it is possible to improve the moist feeling and firm feeling without deteriorating the physical properties such as elongation and hardness.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B29K 105: 12 B29L 31:46 C08L 21:00 (72) Inventor Takayuki Fukutomi Oiwake, Hiratsuka City, Kanagawa Prefecture 2 The No. 1 Yokohama Rubber Co., Ltd. Hiratsuka Factory

Claims (4)

[Claims] 1. Natural rubber and / or synthetic rubber 100
A grip made of a rubber composition in which 20 to 100 parts by weight of a tackifier and 1 to 7 parts by weight of a short fiber reinforced rubber masterbatch as a short fiber amount are mixed with respect to parts by weight. 2. The synthetic rubber is one or two selected from butadiene rubber, isoprene rubber, styrene-butadiene copolymer rubber, acrylonitrile butadiene rubber, chloroprene rubber, ethylene propylene rubber, butyl rubber, acrylic rubber and chlorosulfonated polyethylene. The grip according to claim 1, which is at least one kind of rubber. 3. The tackifier is a liquid polymer and / or
The grip according to claim 1, which is also an oligomer. 4. The short fiber reinforced rubber masterbatch comprises:
Surface treatment of organic short fibers with rubber that has reactivity,
The grip according to claim 1, wherein the grip is kneaded into rubber and melt-extruded to be dispersed in the rubber in the form of ultrafine fibers.